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I hear your problem but im afraid its not a problem in some ways. you see on hilly terrain the engine is going above it's settings. its called altitude control . when the engine is made its set to sea level. with the ecu. this is not a problem with cars that run all the time on flat and slight inclines the ecu can control the air and fuel for this also having the a/c on will lower the engine performance as it puts more strain on the engine. what you will need to do is have your ecu updated. 4x4 dont have this problem as they have the extra setting all ready set to the ecu. some have not been set on them if they come with road tyres. but you can have yours update, also this that can help are a clean air filter clean idle intake , also checking for air leaks on the intake manifold and air lines. fuel filter changed regularly. spark plug's checked or changed. and egr cleaned out regularly ( every 2 years). driving up and down hills put a lot of strain on the engine gears bearings in the drive wheels and dif. the update will help with the fuel to air ratio for the more power to navigate up hills. but regular checks need to be done to keep the rest of the car to be able to do the hills. the smoke you getting out of the vets is the engine over hot. list will make the exhaust manifold come away from the engine just a bit but enough to let some smoke out. its like revving the engine to its limit driving up a hill. eventually the bolts will weaken and snap then you will have a loud blowing sound from the exhaust. the cat should be able to cope with the heat as they work better with more heat. but unburnt fuel can damage the cat. hope this helps you.

Yes there is, at&t techs have issues with philips/magnavox. When you are programming these tv's, you will notice if u get the right code on this particular brand, the light on the tv will blink but not turn on. This is the correct code but, the simultaneous action wont work, you'll have to hit tv first by itself and then hit power. Don't know why, but it is what it is.

I've had similiar issues with a different vehicle. I had to purchase new plugs, rotor, and distributor/spark plug wires. I was running on three cylinders verses four. I did not notice until I was going up hills, where it required more power. If you have a tachometer, keep an eye on it. If it is running slower than it should that could be an indication that there is a problem with the wiring. (probably should be doing about 2500 rpm)

I had a Hyundai that did just the opposite. It would peg the tach to 3,000 rpm well before it was time to shift. Ended up being an ignition coil went bad, which takes the place of the distributer. I replaced the ignition coil and now the engine doesn't have to run as high.